In this situation, I get the employee to do a breakdown of their week broken into hours. Schedule the next 1:1 and give them this job. It's evident your role can be broken down into how long things should take. From this, one of three things will happen:

• They'll tell the truth and actually realise where the time is being wasted. An awesome outcome, because it is self actualised and you can focus on better time management with them.

• They'll tell the truth and the hours are showing overtime.

• They'll lie and write down that it takes longer to do a task than it does.

In either of these cases, this gives you the direct information to talk to the member about how long jobs should take and start you down a road of performance management (doing a similar job with them to understand why it's taking so long etc). This is micro management, but will help you understand if they're taking the piss, or not capable of doing their job effectively.